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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e08f3dd65eb5f1b068e5a9b69ee5d619e1ab3a9bcd6838746e06adc2d75959' 
  AND token = 'tT2J8XCXtLREtwFRObDZ/4+XJwcrRtXFlYewbEoXjjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}